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定位以及三行三列布局方式
guyuqing
Original
1117 people have browsed it

1.固定定位

特点：

  • position: fixed;
  • 固定定位总是相对于html,这样就省去像绝对定位需要一个定位元素当父级的麻烦

实例效果

代码

代码结构

qq.html

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>在线QQ客服</title>
  8.     <link rel="stylesheet" href="./qq.css">
  9.     <link rel="stylesheet" href="modal.css" />
  10. </head>
  11. <body>
  12.     <header>
  13.         <h1>首页</h1>
  14.     </header>
  15.     <div class="modal">
  16.         <div class="modal-backdrop"></div>
  17.         <div class="modal-body">
  18.             <h2>点击下方在线咨询</h2>
  19.             <span class="iconfont icon-QQzaixiankefu"></span>            
  20.         </div>
  21.     </div>    
  22. </body>
  23. </html>

qq.css

  1. @import url("./icons/iconfont.css");
  3. .icon-QQzaixiankefu{
  4.     font-size: 3em;
  5.     background-color: orange;
  6.   }

modal.css

  1. * {
  2.     margin: 0;
  3.     padding: 0;
  4.     box-sizing: border-box;
  5. }
  7. header {
  8.     background-color: #1fa28a;
  9.     /* padding: 上下  左右 */
  10.     padding: 1em 2em;
  11.     overflow: hidden;
  12. }
  14. header h1 {
  15.     text-align: center;
  16. }
  18. .modal {
  19.   position: relative;
  20. }
  22. .modal .modal-backdrop{
  23.     position: fixed;
  24.     top: 0;
  25.     left: 0;
  26.     right: 0;
  27.     bottom: 0;
  28.     background-color: rgb(0, 0, 0, 0.5);
  29. }
  31. .modal .modal-body {
  32.     border: 3px solid;
  33.     padding: 2em;
  34.     margin: 1em;
  35.     background-color: rgb(246, 255, 224);
  36.     position: fixed;
  37.     left: 15em;
  38.     right: 15em;
  39.     top: 10em;
  40.     text-align: center;
  41. }

2.绝对定位

PS：实例内容为传统三行三列定位布局

特点：

  • position: absolute;
  • 绝对定位必须要一个定位父级元素（定位元素）
  • 通过 position: relative;元素转为定位元素

页面显示

代码

html

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>传统定位布局</title>
  8.     <link rel="stylesheet" href="./modal1.css">
  9. </head>
  10. <body>
  11.     <header>页眉</header>
  12.     <div class=container>
  13.         <aside>左侧</aside>
  14.         <main>中间</main>
  15.         <aside>右侧</aside>
  16.     </div>
  17.     <footer>页脚</footer>    
  18. </body>
  19. </html>

css

  1. * {
  2.     margin: 0;
  3.     padding: 0;
  4.     box-sizing: border-box;
  5. }
  7. :root {
  8.     font-size: 10px;
  9. }
  10. body {
  11.     font-size: 1.6rem;
  12. }
  13. header,footer {
  14.     min-height: 10rem;
  15.     background-color: rgba(173, 216, 230, 0.884);
  16. }
  17. .container {
  18.     margin: 1rem 0rem;
  19.     min-height: calc(100vh - 22rem);
  20.     position: relative;
  21. }
  22. .container aside {
  23.     background-color: rgba(255, 255, 0, 0.385);
  24.     width: 15rem;
  25.     position: absolute;
  26.     min-height: inherit;
  27. }
  29. .container aside:last-of-type{
  30.    right: 0rem;
  31.    top: 0rem;
  32. }
  33. .container main{
  34.     position: absolute;
  35.     left: 16rem;
  36.     right: 16rem;
  37.     background-color: rgb(10, 104, 10, 0.45);
  38.     min-height: inherit;
  39. }
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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